/**
 * Copyright (C) 2009 - 2013 SC 4ViewSoft SRL
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.settings.audio.peq.peq.achart;

import com.android.settings.audio.peq.peq.achart.chart.AbstractChart;
import com.android.settings.audio.peq.peq.achart.chart.RoundChart;
import com.android.settings.audio.peq.peq.achart.chart.XYChart;
import com.android.settings.audio.peq.peq.achart.renderer.DefaultRenderer;
import com.android.settings.audio.peq.peq.achart.tools.Pan;
import com.android.settings.audio.peq.peq.achart.tools.PanListener;
import com.android.settings.audio.peq.peq.achart.tools.ZoomListener;

import android.graphics.RectF;
import android.view.MotionEvent;

/**
 * A handler implementation for touch events for older platforms.
 */
public class TouchHandlerOld implements ITouchHandler {
    /** The chart renderer. */
    private DefaultRenderer mRenderer;
    /** The old x coordinate. */
    private float oldX;
    /** The old y coordinate. */
    private float oldY;
    /** The zoom buttons rectangle. */
    private RectF zoomR = new RectF();
    /** The pan tool. */
    private Pan mPan;
    /** The graphical view. */
    private GraphicalView graphicalView;

    /**
     * Creates an implementation of the old version of the touch handler.
     *
     * @param view the graphical view
     * @param chart the chart to be drawn
     */
    public TouchHandlerOld(GraphicalView view, AbstractChart chart) {
        graphicalView = view;
        zoomR = graphicalView.getZoomRectangle();
        if (chart instanceof XYChart) {
            mRenderer = ((XYChart) chart).getRenderer();
        } else {
            mRenderer = ((RoundChart) chart).getRenderer();
        }
        if (mRenderer.isPanEnabled()) {
            mPan = new Pan(chart);
        }
    }

    public boolean handleTouch(MotionEvent event) {
        int action = event.getAction();
        if (mRenderer != null && action == MotionEvent.ACTION_MOVE) {
            if (oldX >= 0 || oldY >= 0) {
                float newX = event.getX();
                float newY = event.getY();
                if (mRenderer.isPanEnabled()) {
                    mPan.apply(oldX, oldY, newX, newY);
                }
                oldX = newX;
                oldY = newY;
                graphicalView.repaint();
                return true;
            }
        } else if (action == MotionEvent.ACTION_DOWN) {
            oldX = event.getX();
            oldY = event.getY();
            if (mRenderer != null && mRenderer.isZoomEnabled() && zoomR.contains(oldX, oldY)) {
                if (oldX < zoomR.left + zoomR.width() / 3) {
                    graphicalView.zoomIn();
                } else if (oldX < zoomR.left + zoomR.width() * 2 / 3) {
                    graphicalView.zoomOut();
                } else {
                    graphicalView.zoomReset();
                }
                return true;
            }
        } else if (action == MotionEvent.ACTION_UP) {
            oldX = 0;
            oldY = 0;
        }
        return !mRenderer.isClickEnabled();
    }

    /**
     * Adds a new zoom listener.
     *
     * @param listener zoom listener
     */
    public void addZoomListener(ZoomListener listener) {
    }

    /**
     * Removes a zoom listener.
     *
     * @param listener zoom listener
     */
    public void removeZoomListener(ZoomListener listener) {
    }

    /**
     * Adds a new pan listener.
     *
     * @param listener pan listener
     */
    public void addPanListener(PanListener listener) {
        if (mPan != null) {
            mPan.addPanListener(listener);
        }
    }

    /**
     * Removes a pan listener.
     *
     * @param listener pan listener
     */
    public void removePanListener(PanListener listener) {
        if (mPan != null) {
            mPan.removePanListener(listener);
        }
    }

}